diff --git a/README.mbt.md b/README.mbt.md
index d02c831..dd25286 100644
--- a/README.mbt.md
+++ b/README.mbt.md
@@ -9,6 +9,11 @@ Use it when you want a MoonBit executable that runs cleanly under `moon run`,
 `wasmtime`, or another WASIp1 host without tying your code to host-specific file
 and terminal APIs.
 
+## ABI compatibility
+
+0.1.0 is compatible with MoonBit < 0.9.3
+0.2.0 is compatible with MoonBit >= 0.9.3
+
 ## Public API
 
 - `args_get()`
diff --git a/internal/ffi/top.mbt b/internal/ffi/top.mbt
index 4987450..cbb4783 100644
--- a/internal/ffi/top.mbt
+++ b/internal/ffi/top.mbt
@@ -39,14 +39,14 @@ pub fn malloc(size : Int) -> Int {
 
 ///|
 pub extern "wasm" fn free(position : Int) =
-  #|(func (param i32) local.get 0 i32.const 8 i32.sub call $moonbit.decref)
+  #|(func (param i32) local.get 0 call $moonbit.decref)
 
 ///|
 #owned(bytes)
 pub extern "wasm" fn byte_array2ptr(bytes : FixedArray[Byte]) -> Int =
-  #|(func (param i32) (result i32) local.get 0 i32.const 8 i32.add)
+  #|(func (param i32) (result i32) local.get 0)
 
 ///|
 #owned(bytes)
 pub extern "wasm" fn bytes2ptr(bytes : Bytes) -> Int =
-  #|(func (param i32) (result i32) local.get 0 i32.const 8 i32.add)
+  #|(func (param i32) (result i32) local.get 0)
diff --git a/moon.mod.json b/moon.mod.json
index b2cc3d5..bc8d357 100644
--- a/moon.mod.json
+++ b/moon.mod.json
@@ -1,6 +1,6 @@
 {
   "name": "moonbit-community/miniio",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "Small, portable WASIp1 I/O SDK for building MoonBit CLI tools and agent skills.",
   "keywords": ["wasi", "wasip1", "io", "cli", "agent"],
   "readme": "README.md",